美国国家航空航天局NASA每日一图(天文)-2017年7月7日

2017 July 7

A View Toward M106
Image Credit & Copyright: Peter Feltoti
Explanation: Big, bright, beautiful spiral, Messier 106 dominates this cosmic vista. The two degree wide telescopic field of view looks toward the well-trained constellation Canes Venatici, near the handle of the Big Dipper. Also known as NGC 4258, M106 is about 80,000 light-years across and 23.5 million light-years away, the largest member of the Canes II galaxy group. For a far away galaxy, the distance to M106 is well-known in part because it can be directly measured by tracking this galaxy's remarkable maser, or microwave laser emission. Very rare but naturally occuring, the maser emission is produced by water molecules in molecular clouds orbiting its active galactic nucleus. Another prominent spiral galaxy on the scene, viewed nearly edge-on, is NGC 4217 below and right of M106. The distance to NGC 4217 is much less well-known, estimated to be about 60 million light-years.

2017年7月7日

向M106的观点
图片来源与版权:Peter Feltoti
说明:大,明亮,美丽的螺旋,梅西耶106支配宇宙的Vista。二度宽伸缩视野朝着训练有素的猎犬座附近的星座,北斗七星的柄。也被称为NGC 4258,M106大约是80000光年,距离地球2350万光年的星系,甘蔗二群中最大的成员。一个遥远的星系,距离为M106部分是著名的因为它可以通过跟踪这个星系的显著的微波激射器直接测量,微波或激光发射。非常罕见的,但自然发生的,脉泽发射是由水分子在其活动星系核周围的分子云中产生的。另一个突出的螺旋星系在现场,看近边,是NGC 4217右下方M106。距离NGC 4217的距离要少得多,估计约为6000万光年。

评论已关闭